SENSOPART FT 25-R-PS-M4M IP69K Enclosure Rating, Proximity Sensor, 800 MM MAX Working Distance, PHOTOELECTRIC, Teach-in Adjustment, M8-4 PIN Metal Plug, PNP-Normally Open Output: Amazon.com: Industrial & Scientific
Water Level Switch/Contactless Liquid Level Detector/Outer Adhering Type Level Sensor PNP Output Interface Sensors Detector: Amazon.com: Industrial & Scientific
Amazon.com: Telemecanique XS Universal Series Inductive Proximity Sensor, Multi-Function, Plastic 117 x 40 x 40 mm Rectangular Body, 3-Wire DC PNP, PNP Input, NO/NC Output, Screw Term. w/ 1/2" NPT Cable Entry :